| DIAGNOSTIC FACILITY |
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| Dry Eye Testing |
Testing for dry eye syndrome includes evaluation of the tear film layer and "tear lake" (an accumulation of tears along the lower eyelid margin), Schirmer testing, evaluation of the tear break-up time, and rose bengal staining.
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| Schirmer Testing |
Schirmer Testing involves placing a thin tear strip (paper) inside the lower eyelid for a given interval of time (usually 5 minutes), with or without topical anesthesia. The tear strip is then removed and the length of the strip that is wet from tears is measured and compared to a standard. Individuals with dry eye syndrome will have less wetting of the tear strip than normal controls.
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| Tear Break-Up Time (TBUT) |
Tear Break-Up Time (TBUT) is another method of evaluation for dry eye syndrome. The ophthalmologist applies fluorescein dye to the tear film, asks the patient not to blink momentarily, and then times the interval until dry spots begin to occur on the corneal surface. This interval of time is known as the TBUT, and the interval is decreased in patients with dry eye syndrome.
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| Rose Bengal Staining |
Rose Bengal Staining is yet another method of evaluating patients for dry eye syndrome. Rose bengal is a dye that, when applied to the ocular surface, is taken up by devitalized (sick) epithelial cells. Positive staining of the conjunctiva with rose bengal is consistent with a diagnosis of dry eye syndrome.
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| DIAGNOSTIC FACILITY |
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| Corneal Topography |
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Nethradhama Superspeciality Eye Hospital were the first in India to utilize the highly sophisticated Orbscan II system, providing pre and postoperative imaging studies of the patient cornea and the ability to diagnose and treat complex refractive disorders not detectable with less advanced imaging devices. Bausch & Lomb's Orbscan™ II is a fully integrated multidimensional diagnostic system that elevates diagnostics beyond mere topography. |
Detection of corneal pathologic conditions most importantly keratoconus and pellucid marginal degeneration: |
Corneal topography often is used clinically for detecting and evaluating of the severity of keratoconus . Corneal topography has detected changes suggestive of early keratoconus in many patients without classic clinical manifestations of this disease that often are classified as subclinical keratoconus.
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| Screening before refractive surgeries: |
The detection of keratoconus is of particular importance in patients who plan to undergo refractive surgery. Evaluation of irregular astigmatism especially after penetrating keratoplasty: Corneal topography is mostly valuable for detection of postoperative astigmatism, planning of removal of sutures, and postoperative fitting of contact lenses.
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| Evaluation of irregular astigmatism especially after penetrating eratoplasty: |
Corneal topography is mostly valuable for detection of postoperative astigmatism, planning of removal of sutures, and postoperative fitting of contact lenses.
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| Evaluation of the effects of corneal refractive surgeries: |
Corneal topography is useful for evaluation of effects and stability of all refractive procedures. |
| Contact lens fitting: |
Corneal topography is especially valuable in fitting complex corneal surfaces (eg, after penetrating keratoplasty). |
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| DIAGNOSTIC FACILITY |
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| Specular Microscopy |
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Specular microscopy is a photographic test used by our ophthalmologist to visualize the human endothelium. The endothelium is the last layer of cells that make up the cornea. This single cell layer is responsible for both supplying nutrients to the rest of the cornea which has no blood supply and removing debris and waste from the cornea. The cells we are born with (about 3000 cells per square millimeter) are all we will ever have. The cells do not regrow or replace themselves. Instead they grow larger to fill gaps of missing or dead cells. When the cell count falls below a certain amount the cornea can no longer remain clear and healthy. This is often the reason a cornea transplant is performed. In our cornea clinic, we perform specular microscopy using a Topcon SP-2000. |
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